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Statements of Assets and Liabilities (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Statements of Assets and Liabilities [Abstract]    
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Investment in platinum - cost $ 699,924us-gaap_InvestmentOwnedAtCost $ 729,594us-gaap_InvestmentOwnedAtCost
Net asset value per share $ 117.43pplt_NetAssetValuePerShare [1] $ 132.59pplt_NetAssetValuePerShare [1]
Common stock, shares issued 5,200,000us-gaap_CommonStockSharesIssued 5,400,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 5,200,000us-gaap_CommonStockSharesOutstanding 5,400,000us-gaap_CommonStockSharesOutstanding
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.